Transcript

00:00:01

>> Click here to read about how Donald Trump won the popular vote. Click here and you're also being duped, as this news is fake. Phony news sites, which have lured readers with such lies as the Pope endorsing Trump, to Hillary Clinton's campaign chief practicing Satanic rituals, have cropped up all over the web and social media this campaign season.

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Most of them against Clinton, leading to accusations they helped fuel a Donald Trump victory. Something Facebook CEO Mark Zuckerberg denied in a post. But now, he and the heads of Google are responding to pressure to crack down on fake news, announcing new measures to ensure the phony sites make no money from advertising.

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Which is their main source of income and a key driver of their existence. Google's AdSense network places ads next to stories and sites, once clicked on, those sites receive ad dollars. Under the new policy fake news sites will be weeded out from that process, drying up their revenue stream and presumably choking them out of existence.

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Facebook, too, will update its policies to block ads from running on phony news sites. The challenge ahead is how to accurately pinpoint fake news through both employee vigilance and computer algorithms.